<%@ page language="java" contentType="text/html; charset=UTF-8" pageEncoding="UTF-8"%>   
<%@ page import="java.util.*,java.io.*" %>   
<%@ page import="java.text.SimpleDateFormat" %>   
<%@ page import="org.apache.commons.fileupload.*" %>   
<%@ page import="org.apache.commons.fileupload.disk.*" %>   
<%@ page import="org.apache.commons.fileupload.servlet.*" %>   
<%@ page import="org.json.simple.*" %>   
<%@ page import="org.apache.struts2.dispatcher.multipart.MultiPartRequestWrapper" %>   
    
<%   
//文件保存目录路径       
//存放在attached下  
String savePath = request.getSession().getServletContext().getRealPath("/") + "/attached/";   
//文件保存目录URL attached/  
String saveUrl = request.getContextPath() + "/attached/";   
//定义允许上传的文件扩展名   
//定义允许上传的文件扩展名   
HashMap<String, String> extMap = new HashMap<String, String>();   
extMap.put("image", "gif,jpg,jpeg,png,bmp");   
extMap.put("flash", "swf,flv");   
extMap.put("media", "swf,flv,mp3,wav,wma,wmv,mid,avi,mpg,asf,rm,rmvb");   
extMap.put("file", "doc,docx,xls,xlsx,ppt,htm,html,zip,rar,gz,bz2");   
    
//允许最大上传文件大小 struts.xml struts.multipart.maxSize=3G   
long maxSize = 3000000000l;   
    
response.setContentType("text/html; charset=UTF-8");   
    
if(!ServletFileUpload.isMultipartContent(request)){   
    out.println(getError("请选择文件。"));   
    return;   
}   
//检查目录   
File uploadDir = new File(savePath);   
if(!uploadDir.isDirectory()){   
    out.println(getError("上传目录不存在。"));   
    return;   
}   
//检查目录写权限   
if(!uploadDir.canWrite()){   
    out.println(getError("上传目录没有写权限。"));   
    return;   
}   
    
String dirName = request.getParameter("dir");//image   
if (dirName == null) {   
    dirName = "image";   
}   
if(!extMap.containsKey(dirName)){   
    out.println(getError("目录名不正确。"));   
    return;   
}   
//创建文件夹   
savePath += dirName + "/";   
saveUrl += dirName + "/";  
File saveDirFile = new File(savePath);   
if (!saveDirFile.exists()) {   
    saveDirFile.mkdirs();   
}   
SimpleDateFormat sdf = new SimpleDateFormat("yyyyMMdd");   
String ymd = sdf.format(new Date());   
savePath += ymd + "/";  
saveUrl += ymd + "/";  
File dirFile = new File(savePath);   
if (!dirFile.exists()) {   
    dirFile.mkdirs();   
}   
if (!dirFile.isDirectory()) {   
    out.println(getError("上传目录不存在 。"));   
    return;   
}   
//检查目录写入权限   
if (!dirFile.canWrite()) {   
    out.println(getError("上传目录没有写入权限。"));   
    return;   
}   
    
 
MultiPartRequestWrapper wrapper = (MultiPartRequestWrapper) request;   
//获得上传的文件名   
String fileName = wrapper.getFileNames("imgFile")[0];//imgFile,imgFile,imgFile   
//获得文件过滤器   
File file = wrapper.getFiles("imgFile")[0];   
    
//检查扩展名   
String fileExt = fileName.substring(fileName.lastIndexOf(".") + 1).toLowerCase();   
if(!Arrays.<String>asList(extMap.get(dirName).split(",")).contains(fileExt)){   
    out.println(getError("上传文件扩展名是不允许的扩展名。\n只允许" + extMap.get(dirName) + "格式。"));   
    return;   
}   
//检查文件大小   
if (file.length() > maxSize) {   
        out.println(getError("上传文件大小超过限制。"));   
        return;   
}    
    
    
//重构上传图片的名称    
SimpleDateFormat df = new SimpleDateFormat("yyyyMMddHHmmss");   
String newImgName = df.format(new Date()) + "_"  
                + new Random().nextInt(1000) + "." + fileExt;   
byte[] buffer = new byte[1024];   
//获取文件输出流   
FileOutputStream fos = new FileOutputStream(savePath +"/" + newImgName);   
//获取内存中当前文件输入流   
InputStream in = new FileInputStream(file);   
try {   
        int num = 0;   
        while ((num = in.read(buffer)) > 0) {   
                fos.write(buffer, 0, num);   
        }   
} catch (Exception e) {   
        e.printStackTrace(System.err);   
} finally {   
        in.close();   
        fos.close();   
}   
//发送给 KE    
JSONObject obj = new JSONObject();   
obj.put("error", 0);   
obj.put("url", saveUrl +"/" + newImgName);   
///zswz/attached/image/20111129/  image 20111129195421_593.jpg   
out.println(obj.toJSONString());   
%>   
<%!   
private String getError(String message) {   
    JSONObject obj = new JSONObject();   
    obj.put("error", 1);   
    obj.put("message", message);   
    return obj.toJSONString();   
}   
%>   